从文本文件逐行读入数据

从.txt文档逐行读入数据，用到FileReader和BufferedReader类：

import java.io.IOException;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.BufferedReader;

public class ReadLine_Test {
	public static void main(String[] args) throws IOException{
		String FilePath = "e:/data.txt";
		FileReader fr = new FileReader(FilePath); //建立FileReader对象，并实例化为fr
		BufferedReader br = new BufferedReader(fr); //建立BufferedReader对象，并实例化为br
		StringBuffer sBuffer = new StringBuffer();
		String Line = br.readLine();   //从文本中读取一行字符串
		
		int i = 1;
		while(Line != null){
			System.out.println("Line"+i+":"+Line);
			sBuffer.append(Line);
			sBuffer.append("
");
			Line = br.readLine();   //从文本中继续读取一行字符串
			i = i+1;
		}
		
		if(br != null){
			br.close();   //关闭BufferedReader对象
		}
		if(fr != null){
			fr.close();   //关闭文件
		}
	}

}